This sidesteps the problem where the atomics check tries to run a test
binary, which cannot be performed during cross compilation. We should
replace this with a better solution in future.
Part of #3710.
bdb 6.X was released under the AGPL, which is incompatible with MIT-licensed
software (the result must be licensed under AGPL). bdb 5.X uses the same license
as bdb 4.8, and thus retains the same compatibility as in upstream Bitcoin.
Thanks to Luke-Jr for raising this issue.
Newer mingw supports the features necessary to enable this api, whereas older
versions didn't. However once enabled (automatically by configure), it triggers
an unrelated build bug.
Since it was not enabled previously anyway, and we don't depend on the
functionality, just disable it across the board.